[dwcsr]

Either way you still have to cut that area out so trim it up to good metal and see what you have. If you can repair it good if not do a roof skin. Id try to repair first if its only in that spot. Go around the edges and poke them with a sharp awl to see if you have spots that are almost through if you find that its weak in a lot of areas that will make your mind up for you. Try to keep the old metal intact so you have some what of a template to for the new pieces with.